- Updated for January 2025
- Based on 2025 FL commercial driver's license manual
Free Florida CDL Air Brakes Test 2025
Today, you will have a chance to review your knowledge of air brakes by taking a practice exam closely based on the information found in the Florida CDL Manual. We have included 30 multiple-choice questions, which each have a hint and an explanation. Make sure that you read each explanation so that you have the maximum information about the topic, and practice as often as you need to feel confident that you will pass the real DMV exam. Good luck now and on your DMV air brake exam, practice well, and drive safely!
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual FL DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- How would you check your truck's slack adjusters?
- What is the best way to test your vehicle's low air pressure warning signal?
- If the air tanks are not drained,
- In Florida, why must you pass a knowledge test on air brakes?
- Which of the following are true about a dual air brake system?
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- At what measurement is the safety valve USUALLY set to open?
- When should you drain your air tanks?
- Which of the following is NOT part of the air brake system?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Which of the following can cause brakes to fade or fail?
- Spring brakes are
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- Slack adjusters are
- When should you use the parking brake?
- The tractor protection valve
- The purpose of a supply pressure gauge is
- After the initial drop, the maximum acceptable leakage rates per minute are
- An antilock braking system (ABS)
- Under which conditions are front wheel brakes good?
- Which of the following should you do before leaving your vehicle unattended?
- Which of the following is NOT part of the drum brake?
- How do brakes work on a long, steep downgrade?
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)?
- Which vehicles must have low air pressure warning signals?
- The low air pressure warning signal will come on before the pressure in the air tanks falls below
- A low pressure warning signal is required on
- All vehicles equipped with air brakes have
- With air brake-equipped vehicles, the parking brakes should be used
- The use of air brakes on a downgrade is only a supplement to the
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We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation. - Expert Content Creation:
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